GX460 Transmission fluid cooler

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Acrad said:
I put a OEM one on mine but any cooler should be as good or better. I also keep the thermostatic switch pinned open at least in the hotter months.

www.clublexus.com

OEM AT #Cooler Install - #transmission - ClubLexus - Lexus Forum Discussion

GX - 2nd Gen (2010-2023) - OEM AT #Cooler Install - #transmission - EDIT: This is more than likely the same setup going into the 2020+ GX 460 with off-road package. This has also long been available since 2010 in Canadian high trim models. As of 2019 this cooler is part of the Executive Package...
www.clublexus.com
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Trying to find info on where/how to pin this switch open. Link?
 
LXJake93 said:
Trying to find info on where/how to pin this switch open. Link?
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The 1st pic is of the trans fluid warmer. Adjacent to it and below the bell housing is where you push essentially a button in and then slide your clip or small nail(whatever you decide). In the 2nd pic you see how it keeps “the button” pushed which keeps the thermostat in the fluid warmer open.

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First 12 hour trip since installing CSF radiator only. Temp was 100+ and humid (east coast). OBDLink trans temp 1 was 204.5 max and temp 2 was 220 max briefly.
 
Chronicle said:
First 12 hour trip since installing CSF radiator only. Temp was 100+ and humid (east coast). OBDLink trans temp 1 was 204.5 max and temp 2 was 220 max briefly.
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That's without an external trans cooler and is your thermostat pinned?

I drove 3 hrs this past weekend, 97-99F on the dash going 80mph trans was at 183F. (678+ pinned thermostat,OEM)
 
Correct. No external cooler yet and pinned thermostat on trans. 183 is a big difference. Once I figure out all the parts I need I'll be adding an external cooler.

Is your cooler run downstream of the radiator connection or stand alone straight back to the trans?
 
Chronicle said:
Correct. No external cooler yet and pinned thermostat on trans. 183 is a big difference. Once I figure out all the parts I need I'll be adding an external cooler.

Is your cooler run downstream of the radiator connection or stand alone straight back to the trans?
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After the OEM radiator

T

Post in thread 'GX460 Transmission fluid cooler'

Installed Hyden 678 using Mountain Pass Bracket, used CBM 103 Vibration Isolators to the bracket to give it that OEM Type Kiss :D
Also installed a 3/8th Magnefine filter prior to the added cooler. I believe these are super important in the GX trans to protect the valve body and the dreaded solenoid codes.

Pinned the thermostat, and put a quart of Idemitsu ATF Type TLS-LV. Got about 1/2 quart back out when I did the level procedure. So new cooler, filter and lines was about ~1/2 a quart of added fluid.



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Is it possible for you all to just delete the OEM trans warmer/thermostat? Honestly that looks like a complicated, low-hanging system. It might take some engineering, but IMO a better system would be a delete plate that has fittings for the trans lines, and caps installed for the engine cooling lines wherever they come out of the engine at. We have nothing like that on our 470s and most of us have transmissions that are still going strong at 200K+ miles.
 
Rednexus said:
Is it possible for you all to just delete the OEM trans warmer/thermostat? Honestly that looks like a complicated, low-hanging system. It might take some engineering, but IMO a better system would be a delete plate that has fittings for the trans lines, and caps installed for the engine cooling lines wherever they come out of the engine at. We have nothing like that on our 470s and most of us have transmissions that are still going strong at 200K+ miles.
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I wouldn’t mind it, but pinning the thermostat is pretty low effort.
 
Finished step 1 of installing the Hayden 678 on the Goliath Offroad mount...which is installing the stuff.
Gotta wait until it stops raining to do step 2 and actually get everything filled and plugged into the OEM lines.

Getting everything bolted up under the hood is pretty easy - reuse 1 OEM bolt and then Goliath gives you 3 longer ones with spacers for the horns and AC line. I left the bumper on and could get everything into place just fine.
 
Rednexus said:
Is it possible for you all to just delete the OEM trans warmer/thermostat? Honestly that looks like a complicated, low-hanging system. It might take some engineering, but IMO a better system would be a delete plate that has fittings for the trans lines, and caps installed for the engine cooling lines wherever they come out of the engine at. We have nothing like that on our 470s and most of us have transmissions that are still going strong at 200K+ miles.
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There are two warmers one in the radiator and another lopped onto the side of the trans. But yea pinned and with the Hayden seems to work good.
BC11SVT said:
Honestly, what I'd really like is a thermostat modded to open at 150 degrees instead of ~190.
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Hah I have the OEM P/N on eBay hoping to snag a cheap broken one to see if we can just unthread and pop in a new thermostat.
 
llm said:
for those curious- CSF radiator, hayden 678, and pinned t stat will bring the trans sump and TC temp to about 75 above ambient. before the upgraded cooling, i used to observe TC temps 30-40f above sump frequently. now they are almost always within 15f, even during slow off road climbs.
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On slow off-road what pan temps are you seeing? What are the outside temps? I'm planning to go out west and expect to be in hot climates slow off-road and want to see if an aux fan is going to be necessary.
 
Banandalorian said:
Finished step 1 of installing the Hayden 678 on the Goliath Offroad mount...which is installing the stuff.
Gotta wait until it stops raining to do step 2 and actually get everything filled and plugged into the OEM lines.

Getting everything bolted up under the hood is pretty easy - reuse 1 OEM bolt and then Goliath gives you 3 longer ones with spacers for the horns and AC line. I left the bumper on and could get everything into place just fine.
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Update: Getting the feed line connected back onto the OEM hardline from the radiator is a real SOB. It took me maybe 2 hours total to do everything else and then I fought with this one stupid hose for like an hour+
 
Chronicle said:
On slow off-road what pan temps are you seeing? What are the outside temps? I'm planning to go out west and expect to be in hot climates slow off-road and want to see if an aux fan is going to be necessary.
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I've found on my rig that temps go up wheeling when lugging uphill. If you are going uphill for a long period of time at say 1,000 rpm in 2nd gear, the trans and coolant will both get warm. Putting the rig in 1st gear and getting up to 1,500 rpm or higher will cause the temps to drop quickly. I presume this is due to the fan and water pump spinning faster.
 
Chronicle said:
On slow off-road what pan temps are you seeing? What are the outside temps? I'm planning to go out west and expect to be in hot climates slow off-road and want to see if an aux fan is going to be necessary.
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It really depends upon what kind of grades you're climbing, if you have it in Lo4 and are manually shifting.
These all play a factor in helping to keep trans temps manageable.
Tip 1: On trails, if you're going up and down steep grades, us your manual select shifting. If you need more pull going up hill or more drag going down, drop into Lo4.
Tip 2: Get an OBDII dongle that'll connect (wirelessly) to your phone that'll monitor all your temps, engine, oil, trans, torque converter, etc. And keep that displayed if you ever have concerns about getting too hot.
 
Chronicle said:
On slow off-road what pan temps are you seeing? What are the outside temps? I'm planning to go out west and expect to be in hot climates slow off-road and want to see if an aux fan is going to be necessary.
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on really slow stuff i’m in 4lo and S1 or S2. during my sedona trip, i climbed up some steep areas of broken arrow, when it was 100+ outside. i don’t recall the pan or TC temp since I was white knuckling and trying not to flip. however i have a 220f pan temp alarm and 240f on TC on my scanguage 3. neither alarm went off.

aux fan would be a good addition and i wish there was a more seamless way for me to install one without getting a new bracket.
 
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